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Using a #define for constant 2^22 (not pow())

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pow() might require the math library to be linked with
rtl-sdl (e.g. when compiling with clang), even though
it's actually constant.

Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Christian Vogel 2012-05-17 21:54:24 +02:00 committed by Steve Markgraf
parent c426e94093
commit 589e96e8d8
1 changed files with 5 additions and 2 deletions
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7
src/librtlsdr.c
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@ -675,6 +675,9 @@ int rtlsdr_set_tuner_gain_mode(rtlsdr_dev_t *dev, int mode)
return r;
}
/* two raised to the power of n */
#define TWO_POW(n) ((double)(1ULL<<(n)))
int rtlsdr_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate)
{
uint16_t tmp;
@ -688,10 +691,10 @@ int rtlsdr_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate)
if (samp_rate > MAX_SAMP_RATE)
samp_rate = MAX_SAMP_RATE;
rsamp_ratio = (dev->rtl_xtal * pow(2, 22)) / samp_rate;
rsamp_ratio = (dev->rtl_xtal * TWO_POW(22)) / samp_rate;
rsamp_ratio &= ~3;
real_rate = (dev->rtl_xtal * pow(2, 22)) / rsamp_ratio;
real_rate = (dev->rtl_xtal * TWO_POW(22)) / rsamp_ratio;
if ( ((double)samp_rate) != real_rate )
fprintf(stderr, "Exact sample rate is: %f Hz\n", real_rate);